Greetings.
Initially I had gotten my Witcher 3 game files from a friend who was able to download and update the game. I did not install it from the physical copy or with an offline installer. I let GoG Galaxy discover the files and everything worked, game shows under my registry and could update properly.

Recently I got the latest version from my friend (after about 10 gigs worth of updates), but now I am unable to complete any updates or Verify/Repair operations, as, after the necessary downloads are completed, an error comes up with the following: "Runtime Error (at -1:0): Cannot Import dll:<utf8>D:\...\The Witcher 3 Wild Hunt\GameuxInstallHelper.dll."

The issue, I believe, is that my game is installed on a different drive letter. Is there somewhere where I can correct these references, to allow it to point to the correct location?

I have checked that the mentioned .dll is indeed in the directory. I have found no solutions regarding this error anywhere, and would greatly appreciate some help in resolving it, as I cannot properly update or repair my game at this point.